Lator axtiebolaget jtjngner



June 30, 1931. a. H. LUNDBIORG FLUID FILTER Original Filed Nov. 10 1926INVENTOR; ,5. fllzmdbar BY having Reissued June 30, 1931 UNITED STATESPATENT OFFICE BBOR HENNING LUNDBORG, OF STOCKHOLM, SWEDEN, ASSIGNOR TOSVENSKA ACKUMU- LATOB AKTIEBOLAGET JUNGNER, 0F STOCKHOLM, SWEDEN, ACORPORATION FLUID FILTER Original No. 1,648,773, dated November 8, 1927,Serial No. 147,588, filed November 10, 1926, and in Sweden June 19,1926. Application for reissue filed March 18, 1929. Serial No. 348,100.

The filters generally used in filtering benzole, oils and the likeconsist of a wire-net a certain fixed size of the meshes. The said ltersare very soon stopped up, and since, in order that the filter shall beeffective, the size of the meshes must be extremely small, it is verydifiicult to effectively clean the same, and the common consequence isthat the net is destroyed in order to let the fluid pass, and thus thefiltering action get lost. Besides, if the filter has once been providedwith a filter net having a certain size of the meshes it meets with aconsiderable trouble to exchange said net for another net more suitablefor the new purpose.

The present invention comprises a filter, which can be easily cleaned byasimple dismounting and which can be made adjustable for differentlyfine filtering through a screw adjusting means.

According to the invention the filter consists of at least two bodiesplaced in a fluid conduit and having opposed parallel surfaces separatedthrough a small space, said bodies being provided with mutuallydisplaced channels communicating through said space and the channels ofthe one body being connected to the inlet and those of the other body tothe outlet for the fluid.

According to one form of embodiment the filter consists of a housinghaving inlet and outlet openings and of a central body inserted orscrewed into said housing and having grooves at the surface, saidgrooves being covered by members so that one or more narrow and, ifdesired, adjustable spaces are formed between the two bodies, said spacebeing so narrow that it is capable of precluding the particles notdesired.

The annexed drawings illustrate a form of embodiment of the invention.Fig. 1 shows a longitudinal section, Fig. 2 shows a crosssection alongthe line BB, and Fig. 3 shows a cross-section along the line A-A ofFig. 1. Figs. 4 and 5 show two different forms of embodiment of thespace, the one having a cylindrical central body and the other a conicalcentral body.

Inserted in the housing 1 is a central body 2 which may be conical orcylindrical and which is connected to the housing by means of the screwplug 4. Connected to the screw plug 4 is also a sleeve-shaped body 5.The central body 2 is provided with annular grooves 6 which open intotwo longitudinal slots 7 communicating with the outlet through bores 8in the screw plug. The covering member 5 is in'the present case providedwith cut slots 9 except in front of the slots 7 in the central bodywhich are entirely covered by said member.

If the central body 2 be made with a smaller outer diameter than theinner diameter of the member 5, there will be formed a certain space 10,Figs. 4 and 5, which permits the fluid to pass freely, but retains thesolid dirt, the size of which exceeds the space 10.

The sleeve-shaped body 5 is held in place by being clamped between theannular flange 11 at the lower end of the central body 2 and the underside of the screw plug 4, the latter having a threaded engagement withthe axial boss 12 at the upper end of the central body 2. Where the endsof the sleeve-shaped body 5 engage the flange 11 and the plug 4. theflange and plug are grooved concentrically with the axis of the centralbody 2 to provide mutual guide surfaces at the engagement of therespective ends of the sleeve-shaped body 5 with the flange 11 and theplug 4, as at 13 and 14'.

If, as according to Fig. 5, the central body .2 be made conical and alsothe member 5 be made with the same conical shape and if the said bodiesbe made adjustable relatively to each other, the space 10 can be madelarger or smaller, and thus it is obtained that one and the same filtercan by a simple adjufi- Inent be used for different purposes.

The passing of the fluid through the filter is the following:

The fluid enters through the inlet in the direction of the arrow, passesthrough the space 10, formed due to the diflerence of the diameters ofthe central body 2 and the covering element 5, is collected in theannularchannels 6, passes through the longitudinal channels 7 and upthrough the bores 8 to the putlet.

The form of embodiment above referred to is an example only and severalother forms ma besuggested.

at I claim is: V 1. In a fluid filter, the combination of a 5 housingclosed at one end and a detachable coveri member at the other end, thehousing h g an inlet and an outlet for the fluid to be filtered, saidcovering member having 1 passages leading from the interior ofv the mousing to the outlet thereof; with a core member detachably connectedwith the covering member, extending into the housing and spacedtherefrom to form an annular chamber communicating with the inlet otthe15 housing, and having a series of grooves extending around itsperiphery with a duct in its circmnferential face intersecting thegrooves and communicating with the passages through the covering member;and a 30 sleeve-shaped filtering screenmounted in the annular chamber,including a series of bands spaced apart and respectively positionedopsi'te to the several grooves in close overarpping relation tothechannel edges of the 5 core member to preclude the passage of solidmatter throilgh the screen into the grooves.

2. In a fluid filter, the combination of a housing closed at one end anda detachable covering member at the other end, the hous- 80 ing havingan inlet and an outlet for the fluid to be filtered, said coveringmember having passages leading from the interior'of the ousing to theoutlet thereof; with a core member detachably connected with the cover-36 ing member, extendin into the housing and spaced therefrom, to rm anannular chamber communicating with the inlet of the housing, and havinga series of peripheral grooves with a duct intersecting the grooves,said 9 duct extending lon 'tudinally of the circ'nniferential wall 0 thecore member and communicating with the passages through the coveringmember; and a sleeve-shaped filtering screen mounted in the annularcham- 5 her, including a series of bands spaced apart and anim erforate'part connecting the bands and extending longitudinally of the screen,said bands being positioned opposite to the several grooves in closeoverlapping so relation to the channel edges of the core member topreclude the passage of solid matbe! through'the screen, and saidimperforate part extending over the 1011' 'tudinal duct of theme-memberto close t e same to the 55 annular chamber.

Signed at Stockholm, Sweden, this 8th day of Februa 1929. c

.BRO t HENNING LUNDBORG.

